Malicious PDF — malware analysis report

Static analysis result for SHA-256 a645768c22338fab…

MALICIOUS

PDF

64.0 KB Created: 2021-05-12 02:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 85e8c8aac15a61f2ed8cb6a67549e0d2 SHA-1: 92b1538bd06624d2fbf57ea7361c4565949cf928 SHA-256: a645768c22338fabb565ea9fee55c90d4342481c73eef3187ce30acbd4f22c04
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7663

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609069a525aec---norigibegivew.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/e8e7f55526d69ab7c29913a4dd6c1172/pozibotolifatuvex.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3ff9b7208---35561430021.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/8fdc97bec11ea5fbcb127ec362bd1bb8/65910800444.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/9ed48522c782def65dc0042914fcc420/vazigobemesadazu.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/5efd94a525d22a36b0ab4bbc11990a4a/50409318748.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a641398bf---buwalesapurowepenibozufa.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754a1814558---bodizenuxikimanevabafa.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2f29a87a8---43510713257.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070b7935f134---watuxafesebixovolo.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607993296175e---58510341899.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16092e943ce39d---39874508227.pdf
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/79c2db6fb63614f01c0cdaccd0c75958/63456317852.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607755c7bd8f9---tojifomewa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=android+tablets+for+sale+micro+center
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c55a.bin
df1e71a30e5b746d2d4048b766527819c9e396ebf0c4b865f56a2278677fa0b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC55A 5084 bytes
font_01_sfnt_off0000d680.bin
4513e11824c3a799fd6acb0c9cad5671c0a012a2b9bd1c599731a50daea55178		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD680 11052 bytes

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